Black Widow. Duh? If Catwoman was an Avenger I would vote for her 200000 times.

Allow me to give you my card....
Oh you cant read? Pitty. It says,
You are now holding the card of the Awesome-Steller-Second-to-none-hot-cool-funny-incredible-magical-beautious-cuddly-warm-kitty-kat-like Secretary

I voted for Hulk, and he did have the most entertaining fight moments, but my vote is mostly for Bruce Banner. His performance was the stand-out for me and absolutely spot-on in terms of comic accuracy.

"You assume I wouldn't want to burn this whole place to the ground."
- lamerde